A student investigates the effect of pH on the breakdown of starch by amylase.
Why is a buffer solution added to each reaction mixture?
to maintain the chosen pH during the reaction
to maintain the chosen temperature during the reaction
to detect the remaining starch during the reaction
to detect the released sugars during the reaction
44 exam-style questions on Edexcel GCSE Biology 1.3 Enzymes, covering 1.3.1 Mechanism of enzyme action, 1.3.2 Denaturation of enzymes, 1.3.3 Factors affecting enzyme activity, and 1.3.4 Measuring energy in food by calorimetry. Each one has a worked solution and a mark scheme showing where the marks go.